-- Copyright (c) 2008--2011 Andres Loeh, 2010--2017 Mikolaj Konarski
-- This file is a part of the computer game Allure of the Stars
-- and is released under the terms of the GNU Affero General Public License.
-- For license and copyright information, see the file LICENSE.
--
-- | Here the knot of engine code pieces and the game-specific
-- content definitions is tied, resulting in an executable game.
module TieKnot
  ( tieKnot
  ) where

import Prelude ()

import Game.LambdaHack.Common.Prelude

import qualified System.Random as R

import Game.LambdaHack.Common.ContentDef
import qualified Game.LambdaHack.Common.Kind as Kind
import qualified Game.LambdaHack.Common.Tile as Tile
import Game.LambdaHack.Content.ItemKind
import Game.LambdaHack.SampleImplementation.SampleMonadServer (executorSer)
import Game.LambdaHack.Server

import qualified Client.UI.Content.KeyKind as Content.KeyKind
import qualified Content.CaveKind
import qualified Content.ItemKind
import qualified Content.ModeKind
import qualified Content.PlaceKind
import qualified Content.RuleKind
import qualified Content.TileKind

-- | Tie the LambdaHack engine client, server and frontend code
-- with the game-specific content definitions, and run the game.
--
-- The action monad types to be used are determined by the 'executorSer'
-- and 'executorCli' calls. If other functions are used in their place
-- the types are different and so the whole pattern of computation
-- is different. Which of the frontends is run inside the UI client
-- depends on the flags supplied when compiling the engine library.
tieKnot :: [String] -> IO ()
tieKnot args = do
  -- Options for the next game taken from the commandline.
  let sdebug@DebugModeSer{sallClear, sboostRandomItem, sdungeonRng} =
        debugArgs args
  -- This setup ensures the boosting option doesn't affect generating initial
  -- RNG for dungeon, etc., and also, that setting dungeon RNG on commandline
  -- equal to what was generated last time, ensures the same item boost.
  initialGen <- maybe R.getStdGen return sdungeonRng
  let sdebugNxt = sdebug {sdungeonRng = Just initialGen}
      -- Common content operations, created from content definitions.
      -- Evaluated fully to discover errors ASAP and to free memory.
      cotile = Kind.createOps Content.TileKind.cdefs
      boostItem :: ItemKind -> ItemKind
      boostItem i =
        let mainlineLabel (label, _) = label `elem` ["useful", "treasure"]
        in if any mainlineLabel (ifreq i)
           then i { ifreq = ("useful", 10000)
                            : filter (not . mainlineLabel) (ifreq i)
                  , ieffects = delete Unique $ ieffects i
                  }
           else i
      boostList :: [ItemKind] -> [ItemKind]
      boostList l | not sboostRandomItem = l
      boostList [] = []
      boostList l =
        let (r, _) = R.randomR (0, length l - 1) initialGen
        in case splitAt r l of
          (pre, i : post) -> pre ++ boostItem i : post
          _ -> assert `failure` l
      boostedItems = boostList Content.ItemKind.items
      cdefsItem =
        Content.ItemKind.cdefs
          {content = contentFromList
                     $ boostedItems ++ Content.ItemKind.otherItemContent}
      coitem = Kind.createOps cdefsItem
      !cops = Kind.COps
        { cocave  = Kind.createOps Content.CaveKind.cdefs
        , coitem
        , comode  = Kind.createOps Content.ModeKind.cdefs
        , coplace = Kind.createOps Content.PlaceKind.cdefs
        , corule  = Kind.createOps Content.RuleKind.cdefs
        , cotile
        , coTileSpeedup = Tile.speedup sallClear cotile
        }
      -- Client content operations containing default keypresses
      -- and command descriptions.
      !copsClient = Content.KeyKind.standardKeys
  -- Wire together game content, the main loops of game clients
  -- and the game server loop.
  executorSer cops copsClient sdebugNxt